-A curious adult from Texas
February 5, 2018
Recombination is a big reason we are all unique. It is also a way to keep our DNA from building up too many mistakes. Recombination can repair broken DNA.
That is the why. To get to the how, we are going to need to talk a bit about our DNA and how it is organized.
DNA is Packaged in Chromosomes
Your DNA has the instructions for making you. If we stretched out those instructions, they’d be over 6 feet long.
Recombination goes something like this:
In this image, the chromosomes are shown as X’s. The darker blue-green one is one chromosome in the pair and the light blue is the other. (You can ignore the a’s, b’s, and c’s.)
Let’s go over how recombination resulted in the chromosome 1 result.
Let’s say these are mom and dad’s chromosome 1’s:
Dad has a blue and an orange one. I have drawn the two mom’s in gray because we won’t be following those. We will only look at the shared DNA from dad.
Now let’s see what happens when dad’s DNA is passed down to the half-brother and the half-sister: